In this lesson, you will learn how to control a stepper motor using your Raspberry Pi and the same L293D motor control chip that you used with the DC motor in Lesson 9.
The Lesson will also show you how to use an alternative driver chip, the ULN2803.

In this lesson, you will learn how to use a DS18B20 with the Raspberry Pi to take temperature readings.
Since the Raspberry Pi has no ADC (Analog to Digital Converter), it cannot directly use an analog temperature sensor like the TMP36, making the DS18B20 a good choice for temperature sensing.